I have had two IPSC race guns built on the Delta. I did have one case blow out on me shooting the magazine out. Scary but nothing permanent. I would avoid hot 10mms in the Delta.

__________________"I'm a good guy with a gun"What do I care if I give up some freedom or rights?....The Goverment will take care of me. This kind of thinking is now in the majority and it should concern you.

"Ask not what you can do for your country, but what free entitlements you can bleed from your country"

Thedudeabides explained about the lack of a ramped barrel in most 1911s. So why not use a ramped barrel? First, some manufacturers and/or shooters think it is more difficult (read "more expensive") to get the geometry correct on a ramped 1911 barrel for feeding purposes. If you try to split your production line into ramped vs. non-ramped barrels, this will increase costs.

__________________
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.

The Delta Elite was designed when factory 10mm ammo was still (only) 200grs @1200fps. It will accommodate full-power 10 in stock configuration.
It's possible, with modern powders and measuring equipment, that you could exceed those numbers and stay within SAAMI specs, but there is no "high pressure 10mm"; max is max.
If you need more power, get a gun which shoots a more powerful cartridge.

If Underwoods ammo is made to SAAMI specs then I don’t understand why it cant be fired in the Delta. I get it that a small portion of the case is unsupported so there must be some pressure threshold for the 1911 rampless platform even within SAAMI standards?

Its just that many of the Underwoods ammo does not seem much different by the numbers than other brands, that’s why I find this odd.

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